Article
Chemistry, Physical
A. Sheikhani, R. Roumina, R. Mahmudi
Summary: The study investigated the hot deformation behavior of an extruded Mg-3 wt% Al-1 wt% Zn (AZ31) alloy with and without rare-earth (RE) elements. It was found that the addition of RE elements enhanced the plasticity of the alloy and reduced the instability region according to the processing maps.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Weiqin Tang, Jeong Yeon Lee, Huamiao Wang, Dirk Steglich, Dayong Li, Yinghong Peng, Peidong Wu
Summary: The unloading behaviors of the rare-earth magnesium alloy ZE10 sheet were studied using mechanical tests and crystal plasticity modeling. The study found significant anisotropy and loading path dependency in the unloading behaviors of ZE10 sheets. Inelastic strains varied under different loading conditions, with basal slip, twinning, and de-twinning being responsible for the behaviors.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Energy & Fuels
Toyoto Sato, Shin-ichi Orimo
Summary: Alloys based on REMgNi4 exhibit reversible hydrogen absorption and desorption reactions, forming three hydride phases. The hydrogen storage capacities and hydride formation pressures are dependent on the compositional ratios and crystal structures of the alloys.
Article
Materials Science, Multidisciplinary
A. Sheikhani, R. Roumina, R. Mahmudi
Summary: The study found that the RE-containing AZ31 alloy exhibits lower flow stress at deformation temperatures above 220 degrees C, and higher flow stress below 220 degrees C, compared to the AZ31 alloy. Texture measurements showed that the AZ31-1RE alloy has a higher Taylor factor at lower temperatures, differing from the Taylor factor values at higher temperatures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Chemical
Glenna Thomas, Craig Sheridan, Peter E. Holm
Summary: This study investigated the impact of acid mine drainage (AMD) on soils in gold and coal mining regions near Johannesburg, South Africa. The results showed evidence of soil acidification, high sulfate and calcium contents, and the presence of high levels of arsenic. The total rare earth element (REE) content ranged from 51.7 to 110 mg/kg and favored the light REEs. These findings indicate the major challenges faced in post-mining land rehabilitation.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Albina S. Isbjakowa, Vladimir V. Chernyshev, Victor A. Tafeenko, Leonid A. Aslanov
Summary: The synthesis temperature affects the isolation of specific products in the metal cation-C6N7O33--H2O system. Low temperatures and short reaction times favor kinetic products, while high temperatures favor thermodynamic products. Different structural types exist in the series of rare earth cyamelurates, and the temperature change has different effects on their structures.
STRUCTURAL CHEMISTRY
(2022)
Article
Energy & Fuels
Juanjuan Ma, Shuyan Li, Jinxi Wang, Shuting Jiang, Balaji Panchal, Yuzhuang Sun
Summary: This study optimized the culture conditions and bioleaching process of Aspergillus niger for the extraction of rare earth elements (REEs) from coal fly ash (CFA). It was found that organic nitrogen sources influenced the morphology and acid production capacity of A. niger, with oxalic acid being the main acid secreted (4.05 mg/L). The initial pH value was identified as the most influential factor affecting the bioleaching process, and by optimizing it, a leaching rate of 30.91% for total REEs in CFA was achieved. The main mechanism of REEs bioleaching by A. niger from CFA was speculated to be proton exchange and organic ligand complexation.
Article
Biotechnology & Applied Microbiology
Michael Paper, Max Koch, Patrick Jung, Michael Lakatos, Tom Nilges, Thomas B. Brueck
Summary: This study investigated the potential of 12 cyanobacterial strains for biosorption of rare earth elements, and Nostoc sp. 20.02 showed the highest adsorption capacity. Synechococcus elongatus UTEX 2973, Calothrix brevissima SAG 34.79, Desmonostoc muscorum 90.03, and Komarekiella sp. 89.12 were also promising strains. The adsorption of metals by the strains had fast kinetics and pH value had a significant impact on the process.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
H. Wang, X. Sun, S. Kurukuri, M. J. Worswick, D. Y. Li, Y. H. Peng, P. D. Wu
Summary: Manufacturers have developed magnesium alloys with remarkable properties by adding rare-earth elements to overcome the limitation in formability at room temperature. The rare-earth magnesium alloys behave differently from conventional alloys, especially in terms of their anisotropic and strain rate sensitive behavior. This study investigates the behavior of a rare-earth Mg alloy ZEK100 sheet at room temperature using an elastic viscoplastic self-consistent polycrystal plasticity model. Different strain rate sensitivities are employed by the model to simulate the strain rate sensitive behaviors under different loading directions and rates. The study highlights the importance of using different strain rate sensitivities for each deformation mode in hexagonal close-packed metals.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Review
Engineering, Environmental
Emmanuel Yaw Owusu-Fordjour, Xinbo Yang
Summary: Bioleaching, using microorganisms to dissolve minerals and extract Rare Earth Elements (REEs) in aqueous media, has gained attention for its potential eco-friendliness compared to other extraction methods. Mixed culture bioleaching is preferred for efficient REEs extraction, promoting closed-loop recycling and reducing supply chain issues. This literature review provides an overview of challenges, opportunities, microorganisms, mechanisms, approaches, parameters, and techno-economic considerations related to REEs bioleaching, and offers recommendations for future advancements.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Green & Sustainable Science & Technology
Olena Artiushenko, Raphael Freire da Silva, Volodymyr Zaitsev
Summary: Rare Earth elements (REEs) are crucial for high-tech and everyday consumer products. The demand for REEs has rapidly grown due to their use in high-tech and sustainable technologies. However, the REEs world market is at risk due to political tensions and low substitutability of REEs mining technology. This review focuses on the adsorptive recovery of REEs from solutions with high content of transition and heavy metals.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Review
Chemistry, Multidisciplinary
Shuai Zhang, Sandra Elizabeth Saji, Zongyou Yin, Hongbo Zhang, Yaping Du, Chun-Hua Yan
Summary: Alloying is an efficient methodology to improve the performance of metallic catalysts, rare-earth metal compounds can integrate the unique orbital structure and catalytic behavior of rare earth elements; these alloys provide an opportunity to tailor electronic properties, tune charged carrier transport, and enhance surface reactivity.
ADVANCED MATERIALS
(2021)
Article
Physics, Multidisciplinary
Satoru Kitsunai, Daiki Fujii, Toshihiro Yoshizumi, Shigehiko Hasegawa, Osamu Nakamura, Masamichi Sakai
Summary: This study investigated Hall effect measurements in nonstoichiometric ytterbium hydrides and found that the conduction type changes depending on the compositions around the stoichiometric composition of YbH2. Positive Hall coefficients were observed in both the alpha-phase and beta-phase ytterbium hydrides, indicating p-type conduction.
Article
Environmental Sciences
Catia Figueiredo, Miguel Caetano, Mario Mil-Homens, Ines Tojeira, Joana R. Xavier, Rui Rosa, Joana Raimundo
Summary: The study characterizes rare earth elements and trace elements in five genera of deep-sea sponges collected in the North Atlantic. These sponges showed an increased accumulation of trace elements compared to other organisms, possibly influenced by volcanic activity. Additionally, a Light REE enrichment and a negative Ce anomaly were observed in all studied species, providing a baseline for future comparisons.
MARINE POLLUTION BULLETIN
(2021)
Article
Environmental Sciences
Philomina Onyedikachi Peter, Binessi Edouard Ifon, Francois Nkinahamira, Kayode Hassan Lasisi, Jiangwei Li, Anyi Hu, Chang-Ping Yu
Summary: This study investigates the relationship between dissolved organic matter (DOM) and Rare Earth Elements (REEs) in sediments from Yundang Lagoon, China. The results show four distinct fluorescent components, with protein-like substances being the most prevalent. Additionally, the total fluorescence intensity and LREE concentrations exhibit a synchronized increase from Outer to Inner to Songbai Lake core sediments. The findings demonstrate a strong correlation between DOM content and pollution levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Materials Science, Multidisciplinary
Kouji Sakaki, Hyunjeong Kim, Eric H. Majzoub, Akihiko Machida, Tetsu Watanuki, Kazutaka Ikeda, Toshiya Otomo, Masataka Mizuno, Daiju Matsumura, Yumiko Nakamura
Summary: The local structure in the di-hydride phases of V-Ti-Cr solid solution alloys was investigated using synchrotron X-ray and neutron total scattering experiments. The crystal structure was found to be face centered cubic (FCC), and there was no difference between the local structure and average structure. The combination of neutron PDF and first-principles calculations with the special quasi-random structure (SQS) models revealed that hydrogen atoms moved towards Cr and away from Ti.
Article
Chemistry, Physical
Kouji Sakaki, Naoyoshi Terashita, Hyunjeong Kim, Shigeru Tsunokake, Eric H. Majzoub, Yumiko Nakamura, Etsuo Akiba
Summary: The hydrogenation properties and structural degradation of Mg2-xPrxNi4 were investigated using in-situ X-ray diffraction. The characteristics varied depending on the chemical composition of Mg2-xPrxNi4.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
V. Charbonnier, H. Enoki, K. Asano, H. Kim, K. Sakaki
Summary: Metal-hydride compressors are considered as an alternative to mechanical compressors in Hydrogen Refueling Stations. In this study, Ti-based AB(2) compounds were synthesized and their hydrogen sorption properties were evaluated. The results showed that these compounds exhibit high sorption pressure and low hysteresis. It was also found that the substitution of Al and Nb in the compounds plays an important role in reducing hysteresis and increasing sorption pressure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Applied
Kohta Asano, Shigenobu Hayashi, Yumiko Nakamura, Etsuo Akiba
Summary: The diffusion and site occupation of hydrogen in the monohydride phase (β phase) of the V1-x-yCrxMoy-H (x + y <= 0.15) system were investigated using proton nuclear magnetic resonance. It was found that the substitution of both Cr and Mo offsets the change in the activation energy for hydrogen diffusion, while our previous study showed that Cr increases the activation energy and Mo decreases it. The diffusion behavior can be explained by the dimension of the interstitial sites and the weighted mean atomic radius of the substitutional metal elements, independent of their affinities for hydrogen and the lattice strain.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Kazutaka Ikeda, Hidetoshi Ohshita, Toshiya Otomo, Kouji Sakaki, Hyunjeong Kim, Yumiko Nakamura, Akihiko Machida, Robert B. Von Dreele
Summary: In situ gas-loading sample holders were developed for two-dimensionally arranged detectors in time-of-flight neutron total scattering experiments, enabling investigation of atomic arrangements during deuterium absorption with time and real-space resolution. The high-resolution transient measurements detected deuterium absorption by palladium within a few seconds, while a double-layered container allowed for experiments at 423 K and 10 MPa hydrogen gas pressure. The deuterium occupation sites in a lanthanum-nickel-aluminium alloy were discussed based on real-space high-resolution data obtained from in situ neutron scattering measurements and reverse Monte Carlo structural modeling.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Materials Science, Multidisciplinary
Naoki Ishimatsu, Kentaro Ishimoto, Kouji Sakaki, Yumiko Nakamura, Naomi Kawamura, Saori I. Kawaguchi, Naohisa Hirao, Satoshi Nakano
Summary: X-ray magnetic circular dichroism, x-ray powder diffraction, and first-principles calculations were used to investigate the effects of dense hydrogenation on a Gd-doped SmCo5Hx compound. The results showed that hydrogenation flipped the direction of Sm 4f magnetic moments and changed the magnetic coupling of Sm 4f with Co 3d moments to ferrimagnetic. The hydrogen occupation in the Sm-3Co tetrahedron played a crucial role in inducing the ferrimagnetic structure in SmCo5Hx.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Physical
M. Legree, V Charbonnier, S. Al Bacha, K. Asano, K. Sakaki, I Aubert, F. Mauvy, J. Sabatier, J-L Bobet
Summary: Hydrolysis of Magnesium with water is a promising method for high-rate H2 production, especially when alloyed with nobler elements. This study investigated the hydrogen generation properties of Magnesium-based alloys with Long Period Stacking Ordered (14 H-LPSO) structures. The results indicated that the rare earth and transition metal elements in the LPSO structure significantly influenced the corrosion and hydrolysis properties of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Kenji Iwase, Takashi Ueno, Seiya Mashii, Hyunjeong Kim, Kouji Sakaki, Kazuhiro Mori
Summary: We investigated the crystal and local structures of La2Co7Hx using synchrotron X-ray diffraction. The La2Co7 with a Ce2Ni7-type structure transformed into La2Co7H7.4 with an orthorhombic structure through the formation of La2Co7H4.1. The lattice parameters of La2Co7H7.4 expanded anisotropically and the local structure showed no significant difference compared to La2Co7 and La2Co7H4.1.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Lars J. Bannenberg, Larissa Blom, Kouji Sakaki, Kohta Asano, Herman Schreuders
Summary: Nanostructured metal hydrides have a crucial role in a hydrogen economy, as the nanostructuring or confinement of these materials significantly affects their structural and functional properties. We demonstrate that confining tantalum as a thin film extends its solubility limit, suppressing the phase transition observed in bulk upon hydrogenation. The continuous elastic deformation of the tantalum unit cell with unequal lattice constants and angles ensures volumetric expansion in the out-of-plane direction, resulting in superb performance as a hysteresis-free optical hydrogen sensor over a wide hydrogen pressure/concentration range.
ACS MATERIALS LETTERS
(2023)
Article
Engineering, Manufacturing
Minako Hosono, Kouji Sakaki, Shigenobu Shimada, Yumiko Nakamura, Shuichi Ino
Summary: We investigate the effect of heating temperature and heating method on a soft metal hydride actuator used as a rescue jack in emergency situations. The actuator operates at temperatures of 50-80 degrees C without the need for electricity or physical exertion. Adjusting the heating temperature and/or the amount of hydrogen-absorbing alloy allows for tuning the operation time, with faster operation at higher temperatures and with greater amounts of alloy. Quicklime is identified as the most practical heat source for the jack, providing storage stability, simplicity, and heating efficiency. With 15 g of alloy and a quicklime heat source, the jack successfully lifted a weight of 100 kg by 50 mm within a minute without electricity or human power.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
Review
Energy & Fuels
Martin Dornheim, Lars Baetcke, Etsuo Akiba, Jose-Ramon Ares, Tom Autrey, Jussara Barale, Marcello Baricco, Kriston Brooks, Nikolaos Chalkiadakis, Veronique Charbonnier, Steven Christensen, Jose Bellosta von Colbe, Mattia Costamagna, Erika Dematteis, Jose-Francisco Fernandez, Thomas Gennett, David Grant, Tae Wook Heo, Michael Hirscher, Katherine Hurst, Mykhaylo Lototskyy, Oliver Metz, Paola Rizzi, Kouji Sakaki, Sabrina Sartori, Emmanuel Stamatakis, Alastair Stuart, Athanasios Stubos, Gavin Walker, Colin J. Webb, Brandon Wood, Volodymyr Yartys, Emmanuel Zoulias
Summary: There has been a significant increase in industrial and public interest in hydrogen technologies recently, as hydrogen is seen as the ideal means for storing, transporting, and utilizing energy in combination with renewable and green energy sources. Green hydrogen production, storage, and usage are considered key technologies in future energy systems. Material-based systems for hydrogen storage and compression offer advantages over traditional systems, including lower maintenance costs, higher reliability, and safety. This paper summarizes the latest developments in hydrogen carriers for storage and compression and provides an overview of research activities in this field.
PROGRESS IN ENERGY
(2022)
Review
Energy & Fuels
Luca Pasquini, Kouji Sakaki, Etsuo Akiba, Mark D. Allendorf, Ebert Alvares, Jose R. Ares, Dotan Babai, Marcello Baricco, Jose Bellosta von Colbe, Matvey Bereznitsky, Craig E. Buckley, Young Whan Cho, Fermin Cuevas, Patricia de Rango, Erika Michela Dematteis, Roman V. Denys, Martin Dornheim, J. F. Fernandez, Arif Hariyadi, Bjrn C. Hauback, Tae Wook Heo, Michael Hirscher, Terry D. Humphries, Jacques Huot, Isaac Jacob, Torben R. Jensen, Paul Jerabek, Shin Young Kang, Nathan Keilbart, Hyunjeong Kim, Michel Latroche, F. Leardini, Haiwen Li, Sanliang Ling, Mykhaylo V. Lototskyy, Ryan Mullen, Shin-ichi Orimo, Mark Paskevicius, Claudio Pistidda, Marek Polanski, Julian Puszkiel, Eugen Rabkin, Martin Sahlberg, Sabrina Sartori, Archa Santhosh, Toyoto Sato, Roni Z. Shneck, Magnus H. Sorby, Yuanyuan Shang, Vitalie Stavila, Jin-Yoo Suh, Suwarno Suwarno, Le Thi Thu, Liwen F. Wan, Colin J. Webb, Matthew Witman, ChuBin Wan, Brandon C. Wood, Volodymyr A. Yartys
Summary: This review summarizes the latest research progress on hydrides based on magnesium and intermetallic compounds for energy storage. It covers topics such as hydrogen sorption mechanisms, synthesis and processing techniques, catalysts, and the development of new compounds. The article highlights the important role of these hydrides in the clean energy transition and the deployment of hydrogen as an energy vector.
PROGRESS IN ENERGY
(2022)
